2011221210021 has 8 divisors (see below), whose sum is σ = 2681639588544. Its totient is φ = 1340808485760.

The previous prime is 2011221210013. The next prime is 2011221210023. The reversal of 2011221210021 is 1200121221102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2011221210021 - 2³ = 2011221210013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011221210023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499081 + ... + 2066766.

It is an arithmetic number, because the mean of its divisors is an integer number (335204948568).

Almost surely, 2^{2011221210021} is an apocalyptic number.

It is an amenable number.

2011221210021 is a deficient number, since it is larger than the sum of its proper divisors (670418378523).

2011221210021 is a wasteful number, since it uses less digits than its factorization.

2011221210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2827131.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2011221210021 its reverse (1200121221102), we get a palindrome (3211342431123).

The spelling of 2011221210021 in words is "two trillion, eleven billion, two hundred twenty-one million, two hundred ten thousand, twenty-one".